MR74zz
MR Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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MR74zz Bearing Product Overview & Core Advantages
The MR74zz is a miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. This single row bearing excels in handling radial loads with high efficiency. Its shielded design provides essential contamination protection while maintaining low friction operation. Manufactured to ABEC1 precision class with chrome steel components, it delivers consistent performance in demanding industrial environments where space is constrained but reliability is critical.
MR74zz Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Performance Benefit |
|---|---|---|
| zz | Double metal shields on both sides | Provides effective contamination protection while allowing higher speeds compared to contact seals |
| MR74 | Standard miniature bearing designation | Indicates 4mm bore diameter, 7mm outside diameter, and 2.5mm width dimensions |
MR74zz Bearing Structural Features & Performance Benefits
Compact Design & High Precision: With ultra-compact dimensions (4×7×2.5mm) and ABEC1 tolerance class, this bearing delivers precise rotational accuracy in space-constrained applications.
Radial Load Capacity: The deep groove raceway and optimized geometry enable efficient handling of radial dynamic loads up to 49 lbf, making it suitable for various mechanical systems.
Shielded Protection: Double metal shields (zz) protect against contamination while maintaining low torque characteristics, extending bearing service life in challenging environments.
High-Speed Capability: The stainless steel cage and precision construction support operation at limiting speeds up to 60,000 rpm, ideal for high-speed miniature applications.
Material Quality: Constructed from chrome steel rings and balls with stainless steel cage and shields, ensuring durability and corrosion resistance in various operating conditions.
MR74zz Bearing Typical Application Areas
- Small DC Motors and miniature motor applications
- Precision Instruments and laboratory equipment
- Office Automation Equipment including printers and scanners
- Medical Devices requiring compact, reliable bearing solutions
- Robotics and automation systems with space constraints
- Consumer Electronics including small fans and drives
- Optical Equipment and precision positioning mechanisms
